A technique to increase the throughput (TP) of transmission of IP packets over a cellular connection between a mobile device (MD) and a network element (NE) is disclosed. An example embodiment of the disclosed technique starches the time period of the slow start phase of a TCP/IP connection between the MD and the NE. Another example embodiment divides the slow-start phase into two or more slow-start-sub phases. Yet, another disclosed embodiment is configured to add, during the slow-start phase, an extra number of bytes that are embedded in extra-number-of packets (ENoP) wherein the value of the ENoP is decreased when the RTT is increased.